In fact, these companies have simplified controls and introduced several useful technical innovations.

The single mixer tap was a brilliant, invaluably useful and ingeniously simple innovation.

The disc-shaped pad allowed players to control action without lifting the thumb and was considered by many Intellivision users to be a useful innovation.

For average investors who are trying to buy 100 shares of Intel, this may not sound like a useful innovation.

Although there were attempts to rediscover Roman methods, there was little useful innovation in road building before the 18th century.

And despite the success of the X Prize, inducement prizes in many fields aren't likely to spur useful innovation.

Evidently, somebody thought this a useful, child-pleasing innovation.

As a result, it has probably generated more interesting discussion than useful innovation.

This is a truly useful innovation, which I'm surprised isn't more widely stocked by plumbers' merchants.

The Admiralty accepted the principle of the turret gun as a useful innovation, and incorporated it into other new designs.